The PMS monitoring system consists of the lower computer part and the upper computer monitoring software. The lower computer part uses the acquisition board to connect 3 angle sensors to measure the vertical and horizontal rotation angle values of the inner arm and the angle value of the outer arm in the vertical direction. The collected analog value is sent to the mainboard through can communication. After the mainboard obtains the analog value, it calculates the relative angle value and position status of the current inner wall and outer arm through some algorithms, and analyzes the status of the boom and whether the position of the QCQC adapter is in the safe area. , the user will be reminded on the interface when the safe area is exceeded. And update the position of the unloading arm on the display screen in real time; the upper computer part communicates with the lower computer through 485 bus, collects the data of the lower computer in real time, and displays the data of the lower computer synchronously in the display interface in real time. 3D actions are also displayed in real time.